Wave Theory, Wavefronts & Doppler Effect
Light emerges out of a convex lens when a source of light is kept at its focus. The shape of wavefront of the light is:
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Answer: (c)
- A point source at the focus gives a diverging spherical wavefront at the lens.
- The convex lens turns these rays into a parallel beam.
- Parallel rays correspond to a plane wavefront.
- So the answer is (c) plane.